JP2626040B2 - Ferroelectric liquid crystal display - Google Patents
Ferroelectric liquid crystal displayInfo
- Publication number
- JP2626040B2 JP2626040B2 JP1086283A JP8628389A JP2626040B2 JP 2626040 B2 JP2626040 B2 JP 2626040B2 JP 1086283 A JP1086283 A JP 1086283A JP 8628389 A JP8628389 A JP 8628389A JP 2626040 B2 JP2626040 B2 JP 2626040B2
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- ferroelectric liquid
- crystal display
- display device
- acrylate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Liquid Crystal Substances (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Liquid Crystal (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は文字や映像を表示する液晶表示装置に関し、
特に高信頼性の強誘電性液晶表示装置を提供するもので
ある。Description: TECHNICAL FIELD The present invention relates to a liquid crystal display device for displaying characters and images,
Particularly, the present invention provides a highly reliable ferroelectric liquid crystal display device.
従来の技術 強誘電性液晶は２枚の基板に挟持された状態において
２つの安定配向状態を持ち、電界を印加することによっ
て一方から他方へ転移させることができ、電界を取去っ
た後も転移後の配向状態を維持するというメモリ効果を
持っている。また、電界に対する応答性がマイクロ秒オ
ーダーと非常に速いという特徴も備えている。2. Description of the Related Art A ferroelectric liquid crystal has two stable alignment states when sandwiched between two substrates, and can be transferred from one to the other by applying an electric field. It has a memory effect of maintaining a later alignment state. It also has the characteristic that the response to an electric field is very fast, on the order of microseconds.
これらの特徴により、強誘電性液晶は走査線数の多い
マルチプレックス駆動の液晶表示装置へ応用した場合、
走査選択期間が短く、非選択期間はメモリ効果によって
安定状態を保持できるためコントラストの低下がないな
ど優れた特性が得られる。Due to these features, ferroelectric liquid crystal is applied to a multiplex drive liquid crystal display device with a large number of scanning lines.
Since the scan selection period is short and the non-selection period can maintain a stable state due to the memory effect, excellent characteristics such as no decrease in contrast can be obtained.
発明が解決しようとする課題 以上のように強誘電性液晶の大きな特徴はメモリ効果
にあり、これにより多走査線のマルチプレックス駆動が
可能となるのであるが、このメモリ効果があるために液
晶に経時変化が起こることが判明した。すなわち、液晶
に全く電界が加わらない状態においては、液晶分子は２
つの安定状態のいずれかにあり、次に電界が印加される
までメモリ効果によりその状態を維持するのであるが、
この無電界放置状態において液晶の配向に変化が生じ、
表示特性が劣化することが分った。Problems to be Solved by the Invention As described above, a major feature of ferroelectric liquid crystals is the memory effect, which enables multiplex driving of multiple scanning lines. It was found that a change over time occurred. That is, when no electric field is applied to the liquid crystal, the liquid crystal molecules
Is in one of two stable states, and maintains that state due to the memory effect until the next electric field is applied.
In this electric field-free state, the orientation of the liquid crystal changes,
It was found that the display characteristics deteriorated.
第３図は初期状態の強誘電性液晶の閾値特性であり、
第４図は透過光度が０のメモリ状態において室温中に10
00時間放置した後の特性である。いずれも縦軸はメモリ
時の透過光度である。第５図に閾値特性の測定方法を示
す。書込みパルスの後400パルス目の光学応答をメモリ
特性としている。1000時間放置後の閾値特性は極性の違
いにより非対称化が激しくまたメモリ安定性も劣化して
いる。FIG. 3 shows the threshold characteristics of the ferroelectric liquid crystal in the initial state.
FIG. 4 shows that at room temperature in a memory state where the transmitted luminous intensity is 0,
This is the characteristic after being left for 00 hours. In each case, the vertical axis indicates the transmitted light intensity at the time of memory. FIG. 5 shows a method of measuring the threshold characteristics. The optical response at the 400th pulse after the write pulse is used as a memory characteristic. The threshold characteristic after leaving for 1000 hours is highly asymmetric due to the difference in polarity, and the memory stability is also deteriorated.
これらの特性の変化は液晶中にあるイオンが強誘電性
液晶分子の分極電場により移動し空間電荷分極場を形成
することや、配向膜界面付近の液晶層の変形などが原因
であると考えられ、閾値特性の変化やメモリ性の低下に
より表示品質が著しく劣化するため、経時変化の防止は
強誘電性液晶表示装置の信頼性向上における重大な課題
となっている。It is thought that these changes in properties are caused by the fact that ions in the liquid crystal move due to the polarization electric field of the ferroelectric liquid crystal molecules to form a space charge polarization field, and the deformation of the liquid crystal layer near the alignment film interface. In addition, since the display quality is remarkably deteriorated due to the change in the threshold characteristic and the deterioration of the memory property, prevention of the change over time is a serious problem in improving the reliability of the ferroelectric liquid crystal display device.
本発明はこのような課題を解決するもので、駆動装置
や配向膜は従来の構成のままで、経時変化による表示品
質の劣化がない高信頼性の強誘電性液晶装置を得ること
を目的とする。The present invention solves such a problem, and an object of the present invention is to obtain a highly reliable ferroelectric liquid crystal device in which a driving device and an alignment film have a conventional configuration and display quality does not deteriorate due to aging. I do.
課題を解決するための手段 本発明の強誘電性液晶装置は前記課題を解決するため
に、強誘電性液晶に少なくとも１種類のアクリル酸エス
テルモノマーまたはメタクリル酸エステルモノマーを添
加した強誘電性液晶組成物を用いるものである。Means for Solving the Problems In order to solve the above-mentioned problems, a ferroelectric liquid crystal device according to the present invention comprises a ferroelectric liquid crystal composition comprising at least one acrylate monomer or methacrylate monomer added to a ferroelectric liquid crystal. The thing is used.
作用 前記手段による作用は、添加されたアクリル酸エステ
ルまたはメタクリル酸エステルの何れかのモノマーが強
誘電性液晶の配向を改善し、無電界状態での放置による
経時変化を防止するものであると考えられる。Action The action by the above means is considered that the added acrylate ester or methacrylate ester monomer improves the orientation of the ferroelectric liquid crystal and prevents a change with time due to being left without an electric field. Can be
以下、本発明の強誘電性液晶表示装置の一実施例を図
面を用いて説明する。Hereinafter, an embodiment of the ferroelectric liquid crystal display device of the present invention will be described with reference to the drawings.
実施例 第１図は本発明の強誘電性液晶表示装置の一実施例に
おける断面図である。Embodiment FIG. 1 is a sectional view of an embodiment of the ferroelectric liquid crystal display device of the present invention.
透明電極パターン（図示されていない）が形成された
基板１表面に配向膜２としてポリビニルアルコール（ク
ラレ（株）製PVA117）膜を塗布し、ナイロン布で一方向
にラビングした後、エポキシ系接着剤をシール材５とし
て前記基板を接合し、基板間にフェノキシエチルアクリ
レートモノマーを0.3wt％添加した強誘電性液晶３（メ
ルク製ZLI−3489）を封入したものである。液晶層の厚
みを決めるスペーサー４は２μｍのシリカビーズを用い
た。実際の使用状態においては、２枚の基板の外側に偏
光素子が配置される。第２図は透過相対光度が０の状態
において室温中約1000時間放置した後の閾値特性であ
る。同図において、ａは前記フェノキシエチルアクリレ
ートモノマーを0.3wt％添加したもの、ｂは0.1wt％添加
したもの、ｃは無添加のものの特性である。無添加のも
のは閾値特性の非対称化が著しいが、0.3wt％添加した
ものはほとんど変化がなく対称かつ急峻な特性を維持し
ている。また、0.1wt％添加では改善効果はあるが閾値
特性の変化が認められる。添加量については、少ない場
合は特性改善効果が少なく、多い場合は配向が乱れる傾
向があった。このため本実施例では0.3wt％としたが、
添加するアクリル酸エステルモノマー物質によって最適
量は異なる。A polyvinyl alcohol (PVA117, manufactured by Kuraray Co., Ltd.) film is applied as an alignment film 2 on the surface of the substrate 1 on which the transparent electrode pattern (not shown) is formed, and rubbed in one direction with a nylon cloth, and then an epoxy-based adhesive. Are bonded together as a sealing material 5, and a ferroelectric liquid crystal 3 (Merck ZLI-3489) containing 0.3 wt% of a phenoxyethyl acrylate monomer is sealed between the substrates. As the spacer 4 for determining the thickness of the liquid crystal layer, 2 μm silica beads were used. In an actual use state, a polarizing element is arranged outside the two substrates. FIG. 2 shows the threshold characteristics after leaving at room temperature for about 1000 hours when the transmitted relative luminous intensity is 0. In the figure, a shows the characteristics of the case where the above-mentioned phenoxyethyl acrylate monomer was added at 0.3 wt%, b shows the characteristics of the case where 0.1 wt% was added, and c shows the characteristics of the case where no phenoxyethyl acrylate monomer was added. In the case of no addition, the asymmetry of the threshold characteristic is remarkable, but in the case of 0.3 wt% addition, there is almost no change and the symmetric and steep characteristic is maintained. Further, addition of 0.1 wt% has an improvement effect, but a change in threshold characteristics is observed. Regarding the addition amount, when the amount is small, the effect of improving the characteristics is small, and when the amount is large, the orientation tends to be disordered. For this reason, in this example, the content was 0.3 wt%.
The optimum amount varies depending on the acrylate monomer material to be added.
アクリル酸エステルモノマーとして他にジシクロペン
テニルアクリレート，シクロヘキシルアクリレート，ベ
ンジルアクリレート，グリシジルアクリレート，あるい
はこれらの物質のアクリル酸基をメタクリル酸基に置換
えたものも同様の効果があった。なお、液晶はZLI−348
9に限定されるものではなく、また配向膜についてもポ
リビニルアルコールだけでなくポリイミド膜、シランカ
ップリング剤、蛋白質膜を使用した場合も同様の効果が
あった。In addition, dicyclopentenyl acrylate, cyclohexyl acrylate, benzyl acrylate, glycidyl acrylate, or those obtained by substituting the acrylate group of these substances with a methacrylic acid group had the same effect as the acrylate monomer. The liquid crystal is ZLI-348
It is not limited to 9, and the same effect was obtained when not only polyvinyl alcohol but also a polyimide film, a silane coupling agent, and a protein film were used for the alignment film.
発明の効果 以上のように本発明は、強誘電性液晶に少なくとも１
種類のアクリル酸エステルモノマーまたはメタクリル酸
エステルモノマーを添加することにより、長期間の放置
によっても閾値特性の経時変化がなく、表示品質の劣化
がない高信頼性の強誘電性液晶表示装置を得ることがで
きる。Effect of the Invention As described above, the present invention provides at least one ferroelectric liquid crystal.
By adding various types of acrylate or methacrylate monomers, a highly reliable ferroelectric liquid crystal display device with no change in threshold characteristics over time even after long-term storage and no deterioration in display quality Can be.
第１図は本発明の一実施例における強誘電性液晶表示装
置の断面図、第２図は本発明の一実施例における強誘電
性液晶表示装置の閾値特性図、第３図及び第４図は強誘
電性液晶表示装置の閾値特性図、第５図は閾値特性測定
方法の説明図である。 １……基板、２……配向膜、３……強誘電性液晶（アク
リル酸エステル添加）。FIG. 1 is a cross-sectional view of a ferroelectric liquid crystal display device according to an embodiment of the present invention, FIG. 2 is a threshold characteristic diagram of the ferroelectric liquid crystal display device according to an embodiment of the present invention, and FIGS. FIG. 5 is a diagram showing a threshold characteristic of the ferroelectric liquid crystal display device, and FIG. 5 is an explanatory diagram of a method for measuring the threshold characteristic. 1 .... substrate, 2 .... alignment film, 3 .... ferroelectric liquid crystal (added acrylate).
Claims (1)
リル酸エステルモノマーまたはメタクリル酸エステルモ
ノマーを添加した強誘電性液晶組成物を用いることを特
徴とする強誘電性液晶表示装置。1. A ferroelectric liquid crystal display device comprising a ferroelectric liquid crystal and a ferroelectric liquid crystal composition obtained by adding at least one kind of acrylate or methacrylate monomer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1086283A JP2626040B2 (en) | 1989-04-05 | 1989-04-05 | Ferroelectric liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1086283A JP2626040B2 (en) | 1989-04-05 | 1989-04-05 | Ferroelectric liquid crystal display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02264219A JPH02264219A (en) | 1990-10-29 |
| JP2626040B2 true JP2626040B2 (en) | 1997-07-02 |
Family
ID=13882504
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1086283A Expired - Fee Related JP2626040B2 (en) | 1989-04-05 | 1989-04-05 | Ferroelectric liquid crystal display |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2626040B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100542082B1 (en) * | 1999-12-20 | 2006-01-10 | 엘지.필립스 엘시디 주식회사 | Method for fabricating a liquid crystal cell |
| KR20010065035A (en) * | 1999-12-21 | 2001-07-11 | 구본준, 론 위라하디락사 | Method for fabrication a liquid crystal display device |
| JP5309645B2 (en) * | 2007-03-30 | 2013-10-09 | Ｄｉｃ株式会社 | Polymer-stabilized ferroelectric liquid crystal composition and liquid crystal display device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH086091B2 (en) * | 1988-07-26 | 1996-01-24 | 出光興産株式会社 | Ferroelectric liquid crystal material composition and liquid crystal optical element |
-
1989
- 1989-04-05 JP JP1086283A patent/JP2626040B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02264219A (en) | 1990-10-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |